Glyphosate Effects on Yield, Nitrogen Fixation, and Seed Quality in Glyphosate‐Resistant Soybean

ABSTRACT Genetically‐modified soybean [Glycine max (L.) Merr.] resistant to glyphosate (N‐phosphono‐methyl‐glycine) herbicide (GR) has turned out to be one of the most highly‐used products of plant engineering. The impacts of the soybean, genetically transformed for glyphosate resistance, on the env...

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Published inCrop science Vol. 54; no. 4; pp. 1737 - 1743
Main Authors Bärwald Bohm, Giani Mariza, Rombaldi, Cesar Valmor, Genovese, Maria Inés, Castilhos, Danilo, Rodrigues Alves, Bruno José, Rumjanek, Norma Gouvêa
Format Journal Article
LanguageEnglish
Published Madison The Crop Science Society of America, Inc 01.07.2014
American Society of Agronomy
Subjects
Cultivars
Herbicides
Nitrogen
Seeds
Soybeans
Brazil
Rio Grande
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Summary:ABSTRACT Genetically‐modified soybean [Glycine max (L.) Merr.] resistant to glyphosate (N‐phosphono‐methyl‐glycine) herbicide (GR) has turned out to be one of the most highly‐used products of plant engineering. The impacts of the soybean, genetically transformed for glyphosate resistance, on the environment under Brazilian soil and climatic conditions are still unknown. For this purpose, two soybean genotypes, one genetically modified (GR BRS 244 RR) and a conventional isogenic genotype were grown under different weed‐control methods: hand weeding and glyphosate or imazethapyr herbicide application. The study was performed in Rio Grande do Sul State with evaluations of soil microbial biomass and respiration, biological nitrogen fixation, isoflavone content in seed and glyphosate, and aminomethylphosphonic acid (AMPA) residues in seeds and soil. The use of GR did not affect soil microbial population, biological nitrogen fixation, or plant yield or isoflavone contents in seed. However, even though we used the recommended application doses, the glyphosate residues in the seeds were above levels permitted by Brazilian law. Also, AMPA residues were detected in the soil and the seeds.
Bibliography:All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permission for printing and for reprinting the material contained herein has been obtained by the publisher.
ISSN:0011-183X
1435-0653
DOI:10.2135/cropsci2013.07.0470